thousands method

String thousands()

Formats a number with thousands separators (commas).

Handles both integers and doubles.

Code of Practice:

1. Formatting an integer:

int largeNumber = 1234567;
String formatted = largeNumber.thousands( ) ;  // '1,234,567'

2. Formatting a double:

double largeDouble = 1234567.89;
String formatted = largeDouble.thousands(); // '1,234,567.89'

Implementation

String thousands() {
  try {
    if (!RegExp(r'^[+-]?([\d]+|[\d]+\.[\d]+)$').hasMatch(this.toString())) {
      return this.toString();
    }
    return this
        .toString()
        .replaceAllMapped(RegExp(r'\B(?=(\d{3})+(?!\d))'), (match) => ',');
  } catch (e) {
    return this.toString();
  }
}